What is involved in ozone depletion?<span><br> </span></h2></div>

Groundwater will not be depleted due to</h2></div>

The bio accumulation of pesticides in birds leads to</h2></div>

Planting of trees on barren land is called </h2></div>

The purpose of biological treatment of waste-water is to</h2></div>

PUC certificate stands for</h2></div>

Deforestation will decrease<span><br> </span></h2></div>

The harmful and unwanted substances which degrade the quality of water are called as ________.</h2></d…